How do you remove a trojan horse like Clampi?

[IrishRose56]

How can a non techie remove a trojan horse like Clampi virus from your pc and know it's completely removed? I have a friend who got it on their Windows 10 new laptop while running The New Internet Explorer The Edge? Anyhelp is appreaciated.

 

[popatim]

Restore an uninfected backup.